Studies of central wavelength of high-power all-fiber superfluorescent sources with Yb-doped double-clad fibers

• Analyze the of relationship between the central wavelength and different parameters of superfluorescent sources (SFS).
• Study the pattern of central wavelength of SFS through the ratio of the derivative of the emission and absorption cross section.
• Realize SFS with central wavelength ranging from 1034.75 nm to 1072.4 nm with six different fibers.

The behavior patterns and dependencies of the central wavelength of high-power all-fiber superfluorescent sources (SFS) were studied based on the steady-state rate equations of Yb-doped fiber lasers. The relationships between the central wavelength and the pumping power as well as the fiber parameters including fiber length, core size, core/clad ratio, and absorption coefficient were analyzed based on the gain coefficient of the gain fiber. Experimental results from ten different fibers are presented, and the results agreed well with the simulations. The central wavelength of the ten SFSs ranged from 1034.75 nm to 1072.4 nm.